2023/04/27 by Jiahao Liu, Bing Liu, Liu, Jiahao +3
Physics and Astronomy · #Astrophysics and Star Formation Studies #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2304.14107
openalex publication_date 2023/04/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
In this paper, we analyzed 12 years of Fermi LAT gamma-ray data towards three nearby giant molecular clouds (GMCs), i.e., R~CrA, Chamaeleon, and Lupus. We calibrated the gas column density of these regions by using the Planck dust opacity map as well as the Gaia extinction map. With both the gamma-ray observations and gas column density maps, we derived the cosmic ray densities in the three GMCs. We found the derived CR spectra have almost the same shape but significantly different normalizations, which may reflect that the distributions of CRs in the vicinity of solar systems are inhomogeneous.